JIS lifting cargo block ZHC Series Marine Cargo Lifting Hook Block Marine Block, Lifting Block, Cargo Block 1) Automatic double-pawl braking system 2) Double-cover protection3) Lighter & more robust construction 4) Low effort to lift maximum load5) Unique hand wheel cover for guiding hand chain at any angle6) Built-in overload protection device7) ISO9001,CE,GS certificated. lifting cargo block